Pump-plunger.



Patented Nov. 27, 1917'.

H. IVI* CLOUDE.

PUMP PLUNGER.'

APPLICATION FILED MAR. I6, 1917.

titi:

HARRY M. CLOUDE, OF CINCINNATI, (II-110.

PUMP-PLUNGER.

Specication of Letters Patent.

Patented Nov. 2"?, LQIIl?.

Application filed March 16, 1917. `Serial No. 155,273.

To all whom t may concern:

Be it known that I, HARRY M. CLOUDE, a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have made certain new and useful Improvements in Pump-Plunygers, of which the following is a specication.

My invention relates to improvements in pump plungers or pistons, and it` consists in the combinatins, constructions and arrangements herein described and claimed.

An object of my invention is to provide a plunger for use with pumps either of the pneumatic or the hydraulic type which will hug the interior of the cylinder closely when making a compression stroke, but which will retract readily from the walls of the cylinder when moving in the opposite direction.

A further object of my invention is to provide a plunger having a resilient cup packing with means for keeping the ends of the cup packing from leaving the walls of the cylinder while permittin the body portion to retract from the wa ls so as to decrease the friction during the stroke of the plunger in one direction and to force the body portion of the cup packing into close Contact with the walls during the stroke in the opposite direction.

A further; object -of my invention is to provide a plunger or piston in which the parts may be readilyassembled or replaced.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointedl out in the appended claims.

My invention is illustrated in the accompanying drawings which form a part of this application, in which V Figure 1 is a side view of a double acting pump having a plunger constructed accordlng to my invention.

Fig. 2 is an enlarged section through the plunger shown in Fig. 1.

Fig. 3 is a section through a modified form of the device.

Fig. 4 is an end of the plunger shown in Fig. 3, and

Fig. 5 is a perspective view of one of the cu paclnngs.

eferring now to Fig. 3 I have shown therein a plunger rod 1 having a reduced portion 2 which is threaded at the end as shown at 3.- Carried by the reduced por- Athe walls of the cylinder.

of a resilient washer 7. The hub 6x of the plate 6 on the opposite side of the plate eX- tends through the opening 8X of the cup packing 8. The form of the latter is shown in Fig. 5. It consists of a buckskin or other suitable member having a cylindrical shape with a closed end which is provided with the opening 8", mentioned above.

On the inside of the buckskin cup packing is a leather washer 9 which is held by means of a late l0 whose hub l0X abuts the hub 11x o a plate or disk 11. The latter is provided with a series of openings 11V, and is held in position by means of a nut 12.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. Assume that the plunger is moving in the direction shown by the arrow in Fig. 8 in a cylinder 13 whose walls are indicated by dotted lines. The fluid which Iis being pressed upon by the plunger enters the openings 11y and forces the .resilient cup packing 8 tightly against stroke the cup collapses so that the friction on the walls of the cylinder is reduced.

It will be observed that the free end of the cup is substantially Hush with the outer portion of the plate 11. Without this plate A11 to keep the free ends of the cup in position these ends will be forced inwardly toward the axis of the plunger under the compression stroke, instead of being forced outwardly as they are when air enters the space or chamber 14 between the plate 11 and the plate 10.

In Fig. 1 I have shown the construction in which a plunger or piston is provlded with means for preventing the leakage of the fluid past the plunger, no matter in what direction the plunger is moving. The

. plunger is shown in connection with a pump In the reverse v respond to the parts 8 to 11 in Fig. 3. It Will be observed that the plate 11 is rst placed in position. Afterward the parts are arranged in their order from left to right. The nut l2 holds all the parts together upon the reduced portion 2 of the plunger rod 1.

In this instance when the plunger moves toward the left in Figs. `1 and 2 compressing the air before it, the' air Will enter the chamber 14 in Fig. 2 and press the cup 8 into close Contact with the Walls and cylinder 13. The cup 8 Will be deflated, that is to say, it Will retract from the Walls thereby presenting less friction. In Fig. 2I have shown the manner in which the cup retracts. The extent of this retraction is exaggerated purposely for the sake of illustration. The provision of the plates 11 and 11 insures the proper Working of the device since it absolutelyA prevents the air from entering between the free ends of the cup and the Walls of the cylinder. Since the cups are held tight to the Walls in the compression strokes, the efficiency of the plunger is very high.

I claim:

1. A plunger comprising a plunger rod, a plate or disk carried by said rod, a cup packing carried by said plate or disk, said cup being disposed between the plate or disk and the inner walls of the cylinder, a plate rigidly secured to said plunger and spaced apart from said first named plate, the ends of the second named plate being in engagement With the interior portion of the cup, said last named plate being perforated.

2. A plunger or piston comprising a plunger rod, a plate or disk carried by the rod, a flexible cup packing having a Closed end in engagement With said plate, an auxiliary plate for holding the closed end of the cup in engagement with the first named plate, said second named plate being disposed Within the cup, and a third plate also disposed Within the eup and spaced from said second named plate, said third named plate being in constant engagement with the interior Walls of the cup and being perforated.

3. A plunger or piston comprislng a plunger rod, a plate or disk carried by the rod, a flexible cylindrical cup packing having a closed end 1n engagement with said plate, a

second plate for holding the closed end of the cup in engagement with the first named plate, said second named plate being disposed Within the cup, and a third plate also disposed Within the cup and spaced from said second named plate, said third named plate being in engagement with the interior Walls of the cup and being perforated, said second named late and said third named plate having a utting hubs and a nut carried by said plunger rod and arranged to bear on said third named plate for holding the parts together.

HARRY M. CLOUDE. 

